Edelbrock adjustment
Thread Starter
Instructor
Joined: Oct 2006
Posts: 181
Likes: 0
From: Des moines Iowa
I am gonna tear into the valves and check them out. I bumped my timing to 17* initial, 36* total with 48* overall and I changed springs so its all in by 2500rpms. I have no pinging or detonation. But while adjusting the fuel mixture I noticed the engine runs rough about 1/2 turn from seated and smoothes out at 1 turn from seated but I am getting smoke at 1 turn out. too rich at 1 turn out???
Racer
Joined: Mar 2006
Posts: 276
Likes: 1
From: Pistoia PT (ITALY)
May I have found your problem!
If the heads you have in your engine don't have a very, very good exhaust port, the single pattern camshaft can be a trouble!
Normally chevy SBC heads have a poor flow number at the exhaust.... for this reason 95% of camshafts have a longer exhaust duration.
Without this your engine will have problem on scavenging the burn gas.... with the consequent contamination of the fresh carge coming from the intake.
In this condition you have to set a quite rich mix at idle which will result in quite opened throttle to keep the engine alive...... with the consequent low vacuum!
May you can try to solve the issue adopting 1.6 rockers on the exhoust.
..... other opinions form motor-head guys ????
If the heads you have in your engine don't have a very, very good exhaust port, the single pattern camshaft can be a trouble!
Normally chevy SBC heads have a poor flow number at the exhaust.... for this reason 95% of camshafts have a longer exhaust duration.
Without this your engine will have problem on scavenging the burn gas.... with the consequent contamination of the fresh carge coming from the intake.
In this condition you have to set a quite rich mix at idle which will result in quite opened throttle to keep the engine alive...... with the consequent low vacuum!
May you can try to solve the issue adopting 1.6 rockers on the exhoust.
..... other opinions form motor-head guys ????
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Instructor
Joined: Sep 2007
Posts: 126
Likes: 0
From: Dallas Texas
I might be inclined to disconnect and plug all the vacuum ports (the main line thru the check valve, the tranny line and the line from the carb to the brake booster) and then take a vacuum reading just to be sure you dont have a leak somewhere else.
6th Gear
Joined: Nov 2007
Posts: 6
Likes: 0
Does The Car Try To Stall When You Make A Fast Stop
(like To Make A Turn)
It Could Be That You Have A Bad Fuel Reg And Its Letting To Much Pressure To The Carb If You Still Have The 82 In The Tank Fuel Pump
Its Best To Reuse The Fuel Lines And Use A Bye Pass Regulator
If You Pumped The Carb Wile It Was Dry The Elderbrock
Carb Rubber Accerlator Pump Will Kind Of Turn Inside Out
Just Take It Apart And Put It Back The Right Way With A Little Lube
And Dont Pump It Till You Have Gas In It
(like To Make A Turn)
It Could Be That You Have A Bad Fuel Reg And Its Letting To Much Pressure To The Carb If You Still Have The 82 In The Tank Fuel Pump
Its Best To Reuse The Fuel Lines And Use A Bye Pass Regulator
If You Pumped The Carb Wile It Was Dry The Elderbrock
Carb Rubber Accerlator Pump Will Kind Of Turn Inside Out
Just Take It Apart And Put It Back The Right Way With A Little Lube
And Dont Pump It Till You Have Gas In It
Thread Starter
Instructor
Joined: Oct 2006
Posts: 181
Likes: 0
From: Des moines Iowa
It does try to stall if its in gear and I try to do a brake stand. Or if its in gear and I hold the brake and rev it the rpms will drop and sometimes die. I put the heaviest spring in the carb and It seemed to help the hesitation off idle. Somtimes the car will spin the tires and the next time will not even on the same location.
